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Thread: Multi touch surface (an interesting paper)

  1. #1
    Junior Member
    Join Date
    Jul 2018
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    Multi touch surface (an interesting paper)

    Looking for possible designs for a musical instrument I've had in mind for a while, I found this very interesting paper:
    https://dl.acm.org/doi/pdf/10.1145/1520340.1520460

    The design seems incredible simple, and from what I understand the resistive ink could be replaced by Velostat. Now, the only thing I don't know how to implement is this: to prevent leaking between tracks, while one is being driven (connected to +5v) the rest are connected to ground.

    I know how to succesively drive the tracks with a multiplexer. But how would I simultaneously connect the rest to ground? Would I need a switch for each track?

  2. #2
    Junior Member
    Join Date
    Jul 2018
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    7
    Ok, say I'm connecting the tracks to the output pins, no multiplexer in between.
    If I set them all to digitalWrite(Low), will all the tracks be simultaneously connected to ground? I know the teensy will set them sequentially, but once it's done, will they all be grounded or will there just be a loop grounding them for microseconds?
    Does the same apply to digitalWrite(High)?

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